YARA · Malpedia signator rules
MALPEDIA_Win_Halfrig_Auto
autogenerated rule brought to you by yara-signator
MalwareHalfrigMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
- Author
- Felix Bilstein - yara-signator at cocacoding dot com
- Date
- 2026-05-04
- Modified
- 2026-05-18
- Score / Quality
- 75 / 75
What this rule detects
autogenerated rule brought to you by yara-signator
Associated malware family: Halfrig.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-halfrig-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Halfrig_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "2112816c-0271-5bde-a230-252c3624eee7"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.halfrig"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.halfrig_auto.yar#L1-L128"
= "N/A"
= "54f2eefc07ca2891769c542d5253d31db4cfcce9bd5cb522e73feea90cd0de51"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "TLP:WHITE"
strings:
$sequence_0 = { 498bcf 8802 488d542420 e8???????? 488d0d64eb0700 e8???????? }
$sequence_1 = { 498bcf 8802 488d542420 e8???????? 488d0d40470700 e8???????? }
$sequence_2 = { 488d0d384f0700 e8???????? 40383d???????? 7435 488bd3 4c8bc7 43301438 }
$sequence_3 = { 40883d???????? 4c893d???????? 488d8d30030000 488d05fcf70300 488bd6 }
$sequence_4 = { 4c898ee0000000 3905???????? 7e4a 488d0df0970400 e8???????? }
$sequence_5 = { 4833d0 4981f801040000 72d8 40883d???????? 4c893d???????? 488d8d30030000 488d05ec650300 }
$sequence_6 = { 0fb600 498bcf 8802 488d542420 e8???????? 488d0d48040600 e8???????? }
$sequence_7 = { 8801 418b06 3905???????? 0f8ea3000000 488d0dcf4f0700 e8???????? 833d????????ff }
$sequence_8 = { 8801 418b06 3905???????? 0f8ea3000000 488d0defba0700 e8???????? 833d????????ff }
$sequence_9 = { 40883d???????? 4c893d???????? 488d8d30030000 488d052cfb0400 488bd6 660f1f840000000000 488d8980000000 }
condition:
7 of them and filesize < 1369088
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 498bcf 8802 488d542420 e8???????? 488d0d64eb0700 e8???????? } | |
| $sequence_1 | hex | { 498bcf 8802 488d542420 e8???????? 488d0d40470700 e8???????? } | |
| $sequence_2 | hex | { 488d0d384f0700 e8???????? 40383d???????? 7435 488bd3 4c8bc7 43301438 } | |
| $sequence_3 | hex | { 40883d???????? 4c893d???????? 488d8d30030000 488d05fcf70300 488bd6 } | |
| $sequence_4 | hex | { 4c898ee0000000 3905???????? 7e4a 488d0df0970400 e8???????? } | |
| $sequence_5 | hex | { 4833d0 4981f801040000 72d8 40883d???????? 4c893d???????? 488d8d30030000 488d05ec650300 } | |
| $sequence_6 | hex | { 0fb600 498bcf 8802 488d542420 e8???????? 488d0d48040600 e8???????? } | |
| $sequence_7 | hex | { 8801 418b06 3905???????? 0f8ea3000000 488d0dcf4f0700 e8???????? 833d????????ff } | |
| $sequence_8 | hex | { 8801 418b06 3905???????? 0f8ea3000000 488d0defba0700 e8???????? 833d????????ff } | |
| $sequence_9 | hex | { 40883d???????? 4c893d???????? 488d8d30030000 488d052cfb0400 488bd6 660f1f840000000000 488d8980000000 } |
Condition
7 of them and filesize < 1369088In plain words (Heuristic)
- The file must be smaller than 1369088 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
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Licence & attribution
Author: Felix Bilstein - yara-signator at cocacoding dot com
Source repository: Malpedia signator rules @ c901f97b7d
Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 2112816c-0271-5bde-a230-252c3624eee7
Metadata
| version | 1 |
|---|---|
| tool | yara-signator v0.6.0 |
| signator_config | callsandjumps;datarefs;binvalue |
| malpedia_rule_date | 20260422 |
| malpedia_hash | a182e35da64e6d71cb55f125c4d4225196523f14 |
| malpedia_version | 20260504 |
| malpedia_license | CC BY-SA 4.0 |
| malpedia_sharing | TLP:WHITE |
Tags:FILE
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